There is an article in the programme about doing away with the four pests, that is, wiping out rats, sparrows, flies and mosquitoes.
纲要里头有一个除四害，就是消灭老鼠、麻雀、苍蝇、蚊子。
The least reach-mark-ratio of four pests densities was rat density.
四害密度控制率最高的为蚊，最低的为鼠；
The least reach-mark-ratio of four pests densities was rat density.
四害密度控制率最高的为蚊，最低的为鼠；
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